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Go to Settings > Camera.
You can select resolution and FPS for video & slo-mo. However, you cannot change the photo resolution.
You you will also be able to choose between high efficiency, using HEIF/HEVC, or most compatible, using JPEG/H.264. This does not directly affect the resolution, but does affect how large the photo and video files are.

Your phone's camera is limited by its hardware. Without opening the case and switching out several integrated circuits (and probably modifying the phone's firmware and operating system) you're not going to change that.
And you forget another thing that many cellphone camera enthousiasts overlook when talking about their hardware, and that's the optics.
The ...

You are right. There are about three different models of the iPhone X, each supporting the cellular networks of different regions of the world.
According to GSM Arena https://www.gsmarena.com/apple_iphone_x-8858.php, they are:
A1865 (USA, Hong Kong, Australia, New Zealand, China)
A1901 (EMEA, UAE, LATAM, Canada, USA - AT&T/T-Mobile, Singapore)
A1902 (...

I can't give you a simple answer, but perhaps I can point you in the right direction.
What you are doing when you change the time/date on your photos is changing its metadata. Metadata is text contained within the file that is read by programs such as the Mac OS Finder when you use Get Info, photo programs, etc... Some programs allow you to edit the ...

The earliest iPhone models to support 802.11ac were the iPhone 6 and iPhone 6 Plus, both introduced in September 2014. As for iPads, the iPad Air 2 was the first iPad model to support 802.11ac - introduced in October 2014.
References
You may find the following links useful:
Apple - iPhone 6 - Technical Specifications*
Mactracker (comparing the specs of ...

Camera+ 2, available in the app store for US$4, is a very powerful app I use instead of Apple's Camera app. It provides Manual Controls, RAW Capture and Editing, Depth Capture & Editing, versatile Shooting Modes, superb Photo Library integration, etc. If you are a seasoned SLR camera user or not, this app will help you get the most out of your iPhone's ...

You would want to update to iOS 12.4.1. It is likely the carrier has a "carrier update" that needs to be applied. You can also try Reset Network Settings to completely rule out the device. After trying these, I would say refer to the carrier.

No web or PC interface are viable.
Just messages on macOS allows a non iOS interface, however all recent iOS devices have full keyboard support. Wired and wireless keyboards work great even on an iPhone and command tab app switching lets you rock keyboard shortcuts and navigate almost everything out of the box without a touch interface.
https://www....

Until recently the latest version of iOS available for the iPhone 5 was iOS 10.3.3.
iOS 10.3.4 and 9.3.6 were updates for older devices (released at the same time as iOS 12.4) to fix a problem that may cause problems with GPS location performance and/or lead to the system date and time being incorrect. It's only because of the nature of the bug they were ...

I suggest starting over -- that is
1) unsubscribe from all podcasts, and restart all devices. Then,
2) do Settings -> Podcasts -> Sync Podcasts and/or Preferences => Store => Sync Playback as described in the notes below your question. Then,
3) Plug in each device to your computer with iTunes open, select the device as shown in the first image, ...

No, it's not possible to log into iCloud website and access voice memos. What the setting implies that the iCloud servers are used to backup and store the voice memo recordings, but you'll need the Voice Memos app on iOS/iPadOS or macOS device to access them.